It promotes things like don't gossip no matter what, walk the walk and talk the talk, etc. and makes you aware of things that you should look out for in your colleagues.
However, if you have some level of human compassion and if you really do carry out every single rule in the book, you may end up being pretty disgusted at yourself, going out at all human expense just to climb up the corporate ladder. The tone the author uses makes the 'rulebook' appear as some kind of cult, and 'no one must know you read this rule book, otherwise you are not a rule player'. Sometimes I found it a bit offensive and manipulative, and makes me wonder whether the author has any moral values or human emotions.
My Favourites:
1) Under promise and over deliver Rule 1.5
2) Know what you want long term Rule 3.1
3) Anticipate threats Rule 3.9
4) Cultivate your support Rule 5.8
5) Don't give too much away Rule 10.5
Good guide for job-seekers and the newly-employed. Very easy to read and suitable for all working people.